hikey/hikey960: Switch to using TARGET_COPY_OUT_VENDOR instead of system for treble

In preparation for transitioning to FULL_TREBLE, switch
to copying files to TARGET_COPY_OUT_VENDOR rather then system/

Credit for this patch goes to Vishal Bhoj <vishal.bhoj@linaro.org>
who basically was the original author and magician
who got things working.

I've only refactored and split up his changes to help
with the submissions.

Change-Id: Ie48c8a57767ae7becb75016148e90405cc916cf4
Signed-off-by: John Stultz <john.stultz@linaro.org>
1 file changed